Europa-List Digest Archive

Wed 02/09/11


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     1. 01:50 AM - Re: Monowheel disk brake (Brian Davies)
     2. 01:51 AM - FW: Monowheel disk brake (Brian Davies)
     3. 01:54 AM - Re: Monowheel disk brake (Brian Davies)
     4. 01:56 AM - FW: Monowheel disk brake (Brian Davies)
     5. 09:34 AM - Re: Monowheel disk brake (Remi Guerner)
     6. 10:52 AM - Re: Re: Monowheel disk brake (Brian Davies)
 
 
 


Message 1


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    Time: 01:50:38 AM PST US
    From: "Brian Davies" <brian.davies@clara.co.uk>
    Subject: Monowheel disk brake
    Remi, I did not have any problem when I had a mono but I have had problems on a racing car recently that meant I had to learn fast about disk brake technology. I think your problem could be lack of bedding in of new brakes. In order to work correctly the brakes need to be applied at about 50% normal for a number of times and then allowed to cool down fully. During this process, pad material should be deposited on to the disc to create a shiny surface that will give smooth braking action and long life. If this process does not take place you will get tearing of the disc material/ rough surface, leading to poor braking action and short pad life. The Trigear Owners Manual describes a brake bedding procedure that requires two consecutive full stop braking applications from 30 to 35knots without allowing the brakes to cool between each application. You then need to check that the conditioning process has been successful by looking for the shiny surface and also checking that the brakes will hold during a static full power run. I hope this helps. Regards Brian Davies From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of Guerner Remi Sent: 08 February 2011 21:23 Subject: Europa-List: Monowheel disk brake Hi all, My original brake pads lasted 635 flight hours. The second set (Cleveland 66-106) lasted only 159 hours. I also had to refill the master cylinder every 20 hours or so to compensate for the rapid pad wear. I then discovered that the surface of the disc was showing circular grooves with some embedded steel particles emerging from the surface. I decided to order a new disk from Europa (142 british pounds + VAT) . I flew with the new disk and new pads (Rapco RA66-106) for the first time yesterday. The attached picture shows the surface of the new disk after only two full stop landings with moderate braking. The aspect of the surface is very similar to the old disk one. I do not expect the new pads to last long with such a rough surface! Has anyone experienced this problem? Any solution? Regards Remi Guerner F-PGKL


    Message 2


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    Time: 01:51:04 AM PST US
    From: "Brian Davies" <bdavies@dircon.co.uk>
    Subject: Monowheel disk brake
    From: Brian Davies [mailto:brian.davies@clara.co.uk] Sent: 09 February 2011 09:46 Subject: RE: Europa-List: Monowheel disk brake Remi, I did not have any problem when I had a mono but I have had problems on a racing car recently that meant I had to learn fast about disk brake technology. I think your problem could be lack of bedding in of new brakes. In order to work correctly the brakes need to be applied at about 50% normal for a number of times and then allowed to cool down fully. During this process, pad material should be deposited on to the disc to create a shiny surface that will give smooth braking action and long life. If this process does not take place you will get tearing of the disc material/ rough surface, leading to poor braking action and short pad life. The Trigear Owners Manual describes a brake bedding procedure that requires two consecutive full stop braking applications from 30 to 35knots without allowing the brakes to cool between each application. You then need to check that the conditioning process has been successful by looking for the shiny surface and also checking that the brakes will hold during a static full power run. I hope this helps. Regards Brian Davies From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of Guerner Remi Sent: 08 February 2011 21:23 Subject: Europa-List: Monowheel disk brake Hi all, My original brake pads lasted 635 flight hours. The second set (Cleveland 66-106) lasted only 159 hours. I also had to refill the master cylinder every 20 hours or so to compensate for the rapid pad wear. I then discovered that the surface of the disc was showing circular grooves with some embedded steel particles emerging from the surface. I decided to order a new disk from Europa (142 british pounds + VAT) . I flew with the new disk and new pads (Rapco RA66-106) for the first time yesterday. The attached picture shows the surface of the new disk after only two full stop landings with moderate braking. The aspect of the surface is very similar to the old disk one. I do not expect the new pads to last long with such a rough surface! Has anyone experienced this problem? Any solution? Regards Remi Guerner F-PGKL


    Message 3


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    Time: 01:54:30 AM PST US
    From: "Brian Davies" <brian.davies@clara.co.uk>
    Subject: Monowheel disk brake
    Remi, Further to my last post, you will need to skim off the rough surface on the disc, either in a lathe or by hand with an oil stone, before doing the bedding in process. Regards Brian From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of Guerner Remi Sent: 08 February 2011 21:23 Subject: Europa-List: Monowheel disk brake Hi all, My original brake pads lasted 635 flight hours. The second set (Cleveland 66-106) lasted only 159 hours. I also had to refill the master cylinder every 20 hours or so to compensate for the rapid pad wear. I then discovered that the surface of the disc was showing circular grooves with some embedded steel particles emerging from the surface. I decided to order a new disk from Europa (142 british pounds + VAT) . I flew with the new disk and new pads (Rapco RA66-106) for the first time yesterday. The attached picture shows the surface of the new disk after only two full stop landings with moderate braking. The aspect of the surface is very similar to the old disk one. I do not expect the new pads to last long with such a rough surface! Has anyone experienced this problem? Any solution? Regards Remi Guerner F-PGKL


    Message 4


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    Time: 01:56:09 AM PST US
    From: "Brian Davies" <bdavies@dircon.co.uk>
    Subject: Monowheel disk brake
    From: Brian Davies [mailto:brian.davies@clara.co.uk] Sent: 09 February 2011 09:52 Subject: RE: Europa-List: Monowheel disk brake Remi, Further to my last post, you will need to skim off the rough surface on the disc, either in a lathe or by hand with an oil stone, before doing the bedding in process. Regards Brian From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of Guerner Remi Sent: 08 February 2011 21:23 Subject: Europa-List: Monowheel disk brake Hi all, My original brake pads lasted 635 flight hours. The second set (Cleveland 66-106) lasted only 159 hours. I also had to refill the master cylinder every 20 hours or so to compensate for the rapid pad wear. I then discovered that the surface of the disc was showing circular grooves with some embedded steel particles emerging from the surface. I decided to order a new disk from Europa (142 british pounds + VAT) . I flew with the new disk and new pads (Rapco RA66-106) for the first time yesterday. The attached picture shows the surface of the new disk after only two full stop landings with moderate braking. The aspect of the surface is very similar to the old disk one. I do not expect the new pads to last long with such a rough surface! Has anyone experienced this problem? Any solution? Regards Remi Guerner F-PGKL


    Message 5


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    Time: 09:34:42 AM PST US
    Subject: Re: Monowheel disk brake
    From: "Remi Guerner" <air.guerner@orange.fr>
    Thank you Brian, this is good advice. I will try it. However I am wondering why on my car the pads and the disks last thousands times more without having to bother with conditioning! I really think there is compatibility problem between the Europa disk material and the (non asbestos) metallic lining. Regards Remi Read this topic online here: http://forums.matronics.com/viewtopic.php?p=330300#330300


    Message 6


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    Time: 10:52:11 AM PST US
    From: "Brian Davies" <bdavies@dircon.co.uk>
    Subject: Re: Monowheel disk brake
    You are partially correct. It is the pad material that makes some braking systems more critical. Racing cars and some aeroplanes seem to have this problem. Brian -----Original Message----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of Remi Guerner Sent: 09 February 2011 17:31 Subject: Europa-List: Re: Monowheel disk brake --> <air.guerner@orange.fr> Thank you Brian, this is good advice. I will try it. However I am wondering why on my car the pads and the disks last thousands times more without having to bother with conditioning! I really think there is compatibility problem between the Europa disk material and the (non asbestos) metallic lining. Regards Remi Read this topic online here: http://forums.matronics.com/viewtopic.php?p=330300#330300




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